Update memory map and drop unused code

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[github-actions]

Benchmark for Linux-cuda e1c414d

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Test	Base	PR	%
fib/100/proof	646.1±6.59ms	639.7±5.99ms	-0.99%
fib/100/run	300.8±5.05ms	298.7±5.20ms	-0.70%
fib/200/proof	653.0±10.11ms	644.5±8.30ms	-1.30%
fib/200/run	305.5±7.58ms	300.0±4.08ms	-1.80%

Benchmark for Linux-default e1c414d

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Test	Base	PR	%
fib/100/proof	2.3±0.02s	2.3±0.03s	0.00%
fib/100/run	339.4±1.17ms	330.8±1.79ms	-2.53%
fib/200/proof	2.3±0.02s	2.3±0.01s	0.00%
fib/200/run	352.6±4.87ms	339.8±10.08ms	-3.63%

Benchmark for macOS-default e1c414d

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Test	Base	PR	%
fib/100/proof	1606.9±14.93ms	1604.9±8.69ms	-0.12%
fib/100/run	118.0±0.76ms	116.8±0.59ms	-1.02%
fib/200/proof	1612.6±7.31ms	1609.5±5.25ms	-0.19%
fib/200/run	118.4±0.30ms	118.1±0.70ms	-0.25%

Benchmark for macOS-metal e1c414d

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Test	Base	PR	%
fib/100/proof	463.9±4.90ms	462.5±5.07ms	-0.30%
fib/100/run	112.6±0.70ms	112.2±0.47ms	-0.36%
fib/200/proof	467.1±6.30ms	462.9±3.52ms	-0.90%
fib/200/run	114.4±0.66ms	114.2±0.73ms	-0.17%

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Benchmark for Linux-cuda 3e69394

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Test	Base	PR	%
fib/100/proof	760.7±48.04ms	718.5±11.54ms	-5.55%
fib/100/run	316.0±13.40ms	295.2±8.06ms	-6.58%
fib/200/proof	744.8±43.96ms	718.5±13.93ms	-3.53%
fib/200/run	322.8±11.03ms	297.5±10.55ms	-7.84%

Benchmark for Linux-default 3e69394

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Test	Base	PR	%
fib/100/proof	2.3±0.03s	2.3±0.03s	0.00%
fib/100/run	336.9±4.34ms	325.8±4.34ms	-3.29%
fib/200/proof	2.3±0.02s	2.3±0.01s	0.00%
fib/200/run	339.1±4.26ms	335.0±10.37ms	-1.21%

Benchmark for macOS-default 3e69394

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Test	Base	PR	%
fib/100/proof	1609.8±23.83ms	1598.0±21.67ms	-0.73%
fib/100/run	110.7±0.28ms	110.4±0.39ms	-0.27%
fib/200/proof	1602.0±8.26ms	1601.1±9.64ms	-0.06%
fib/200/run	112.5±0.44ms	112.3±0.66ms	-0.18%

Benchmark for macOS-metal 3e69394

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Test	Base	PR	%
fib/100/proof	464.0±6.18ms	461.8±4.16ms	-0.47%
fib/100/run	112.6±0.23ms	111.8±0.44ms	-0.71%
fib/200/proof	465.6±5.67ms	464.5±3.53ms	-0.24%
fib/200/run	114.6±0.48ms	113.6±0.56ms	-0.87%